Giant asteroids once peppered the early Earth's surface to create an incredibly violent environment.... But, scientists have now revealed that these bombardments of space impactors happened far more than previously believed.We already know that several large meteor strikes hit Earth before the arrival of humans. Most notably, the Chicxulub asteroid hit Earth about 66 million years ago, which ultimately led to the extinction of the dinosaurs. The asteroid is believed to be about 150km wide, and